Sydney may finally have the hero it needs, after Iron Boy defeated Ultron on the steps of the Sydney Opera House and rescued make-a-wish newsreader Hope Joy following an urgent request from police, the premier and Iron Man himself.

Nine-year-old Domenic was called upon by NSW Police Commissioner Andrew Scipione to help rescue Joy after henchmen of Ultron Prime kidnapped the fictional newsreader and held her captive on Sydney's Clark Island on Thursday.

Iron Boy moments after taking down one of Ultron's henchmen

Before he had time to celebrate his victory over the evildoer's cronies, Domenic received word the evil cyborg Ultron was threatening the Sydney Opera House. But the hero was undeterred, quickly defeating the robotic monster and his gang with well placed blasts from his repulser cannons.

After the villains were led away in cuffs and asked if he was seeking the fame, the humble hero told reporters he didn't know what that means.

Domenic was presented with a medal of valour on the steps of the Opera House by Comm. Scipione.

"He gets out of bed every day and he's brave, every day. To be associated with that, to recognise him, and all those kids just like him, it's a real honour for us as police force to say thank you," Scipione said.